JP2516328Y2 - Inductance components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to inductance components such as line filters, transformers, and choke coils.

[Prior Art] FIG. 4 shows an example of a conventional inductance component. This inductance component is wound between a bobbin 1 having flanges 3 and 3 at both ends and an intermediate portion of a cylindrical body (which is hidden behind the coils 5 and 5) and the flanges 3 and 3. It has coils 5 and 5 and a pair of U-shaped cores 2 and 2. One piece of the cores 2 and 2 is fitted into the body of the bobbin 1 around which the coils 5 and 5 are wound from both sides thereof, and the ends thereof are abutted in the bobbin 1 while the other ends of the cores 2 and 2 are attached. Are abutted against each other outside bobbin 1. In this state, a U-shaped core holding metal fitting 4 having elasticity is fitted so as to sandwich the two cores 2, 2 and the core 2,
2 is pinched from both sides.

Base portions 9, 9 are provided at the lower portions of the flanges 3, 3 at both ends of the bobbin 1, and lead wires of the coils 5, 5 are connected to lead pins 8, 8 ...

The inductance component assembled in the state shown in FIG. 4 includes at least the cores 2 and 2 and the core holding metal fittings 4.
Insulating paint such as varnish is applied to the portion of (1) and the cores 2 and 2 are fixed so as not to separate.

However, such a conventional inductance electronic component has a drawback that the varnish treatment takes a long time and a product manufacturing cycle is long. Therefore, in order to solve such a drawback, Japanese Utility Model Laid-Open No. 1-122222 and Japanese Unexamined Patent Publication No.
As shown in Japanese Patent No. 283805, a means for adhering the cores 2 and 2 in spots with an adhesive has been proposed.

[Problems to be Solved by the Invention] Since the cores 2 and 2 are formed of a magnetic material such as ferrite and form a closed magnetic path through which the magnetic fields generated by the coils 5 and 5 pass, their magnetic resistance is It is desirable to be as low as possible.

However, in the above-mentioned conventional inductance component, since the joining ends of the cores 2 and 2 are basically adhered with an adhesive, as shown in FIG. If there is a slight gap 7, the adhesive 10 will enter into it, and the magnetic resistance of the cores 2 and 2 will increase, and the inductance characteristics of the inductance electronic component will deteriorate.
Furthermore, since the adhesive 10 is mainly composed of resin and has a high thermal expansion property, the adhesive 10 that has entered the gap 7 between the joint ends of the cores 2 and 2 due to the temperature change is thermally expanded. The gap 7 between the cores 2 and 2 is widened. Along with this, the gap 7 between the joint ends of the cores 2 and 2 gradually expands, and the inductance characteristics of the inductance electronic component deteriorate with time.

The cores 2 and 2 are made of ceramic such as ferrite, and the bobbin 1 is made of resin. Therefore, core 2,
The coefficient of thermal expansion of the bobbin 1 is considerably higher than that of the bobbin 1. Therefore, if the two cores 2 and 2 are completely fixed to the bobbin 1, thermal stress is generated in them due to the difference in thermal expansion between the cores 2 and 2 and the bobbin 1 due to temperature fluctuations. Due to this thermal stress, the gap 7 between the joint ends of the cores 2 and 2 is gradually widened, and the inductance characteristics are deteriorated over time.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems, and to provide an inductance component which is less affected by an adhesive and which can form a stable joint state of a core.

[Means for Solving the Problem] That is, in order to achieve the above object, in the present invention, a bobbin 1 having coils 5 and 5 wound around the body and one piece from both ends in the body of the bobbin 1. A pair of cores 2 each of which is inserted into the bobbin 1 and has both ends abutted inside and outside the bobbin 1,
2 and an elastic U-shaped core holding metal fitting 4 which is fitted on both sides so as to sandwich both cores 2 and 2, one core 2 has a bobbin 1 and a core holding metal fitting at an intermediate portion thereof. 4 is bonded to the core 4 with the adhesive 10, and the other core 2 is bonded only to the core holding metal fitting 4 at an intermediate portion thereof.
Provided is an inductance component characterized by being bonded at 10.

[Operation] In the above-described inductance component, the pair of cores 2, 2
However, the magnetic resistance of the cores 2 and 2 is not affected by the adhesive 10 because they are bonded to the bobbin 1 and the core holding metal fitting 4 at their intermediate portions instead of at their joint ends. Moreover, both cores 2 and 2 are fixed to the core holding metal fitting 4 for joining them, and only one core 2 is fixed to the bobbin 1, and the other core 2 is directly attached to the bobbin 1. Since it is not fixed and is fixed only to the sandwiching metal 4, the one core 2 is directly fixed to the bobbin 1 and the other core 2 is fixed to the bobbin 1 via the core sandwiching metal 4.
Therefore, even if the bobbin 1 undergoes thermal expansion and contraction due to thermal fluctuation, one core 2 is not directly fixed to the bobbin 1, so that the thermal expansion of the bobbin 1 does not directly reach the cores 2 and 2. The thermal expansion is absorbed by the elasticity of the core holding metal fitting 4. Therefore, almost no thermal stress is generated in the cores 2 and 2, and the joining state of the end portions of the cores 2 and 2 is maintained in a constant state. As a result, an inductance electronic component having stable characteristics can be obtained.

[Embodiment] Next, an embodiment of the present invention will be specifically described with reference to FIGS. 1 to 3.

As described above, the inductance component is a bobbin 1 having flanges 3, 3 ... at both ends and a middle part of a cylindrical body.
And the coils 5, 5 wound between the flanges 3, 3.
And a pair of U-shaped cores 2 and 2. Base parts 9, 9 are provided on the lower portions of the flanges 3, 3 at both ends of the bobbin 1, and lead pins 8, 8 ... Are projected from the base parts 9, 9, and lead wires of the coils 5, 5 are connected thereto. .

One piece of the cores 2 and 2 is fitted into the body of the bobbin 1 on which the coils 5 and 5 are wound from both sides thereof, the ends of the bobbins 1 are abutted against each other, and the other end of the cores 2 and 2 Are abutted against each other outside bobbin 1. In this state, a U-shaped core holding metal fitting 4 having elasticity is fitted so as to sandwich the two cores 2, 2 and the core 2,
2 is pinched.

Each of the line filter, the transformer, and the choke coil basically has the above-described configuration. However, the winding directions of the coils 5, 5 and the combinations thereof are different, and the terminal pins 8, 8,. Connection to is different.

In the embodiment shown in FIG. 1, the side surface of one core 2 is adhered to one end portion of the core holding metal fitting 4 with an adhesive 10, and one corner portion of the other core 2 is one shoulder portion of the bobbin 1. And one corner of the core holding metal fitting 4 with an adhesive 10. Further, in the embodiment shown in FIG. 2, the side surface of one core 2 is adhered to one end of the core holding metal fitting 4 and one side surface of the bobbin 1 with the adhesive 10, and the one core intermediate portion of the other core 2 is bonded. Are bonded to the middle part of the core holding metal fitting 4 with an adhesive 10. Further, in the embodiment shown in FIG. 3, the side surface of one core 2 is bonded to one end of the core holding metal fitting 4 and one side surface of the bobbin 1 with the adhesive 10, and the other core 2
One corner portion is bonded to one corner portion of the core holding metal fitting 4 with an adhesive 10.

The above is an example of the bonding points of the cores 2 and 2, the core holding metal fitting 4, and the bobbin 1, and the portions other than the joint end portions of the cores 2 and 2 are bonded, and one of them is bonded to the bobbin 1 and the core holding metal fitting 4.
In addition, if the other is bonded only to the core holding metal fitting 4, it may be bonded at any place.

[Effects of the Invention] As described above, according to the present invention, both end surfaces of the cores 2 and 2 can be joined in a constant state by the elasticity of the core holding metal fitting 4 without being affected by the adhesive 10. it can. As a result, an inductance component having stable inductance characteristics can be obtained.

[Brief description of drawings]

1 to 3 are perspective views of an inductance component showing each embodiment of the present invention, FIG. 4 is a perspective view of an inductance component showing a conventional example, and FIG. 5 is a core and a core of the same component. It is sectional drawing which shows a joined state typically. 1 ... Bobbin, 2 ... Core, 4 ... Core clamping metal fitting, 4a,
4b …… End of core clamping metal, 5 …… Coil, 10 …… Adhesive

Claims (1)

(57) [Scope of utility model registration request] 1. A bobbin 1 having coils 5 and 5 wound around a body.
One piece is inserted into the body of the bobbin 1 from both ends thereof, and the pair of cores 2 and 2 having both ends abutted inside and outside the bobbin 1 are sandwiched between the cores 2 and 2. In an inductance component provided with elastic U-shaped core holding metal fittings 4 fitted on both sides thereof, one core 2 is adhesive to the bobbin 1 and the core holding metal fitting 4 at an intermediate portion thereof.
Inductance component characterized in that the core 2 is adhered by 10 and the other core 2 is adhered by an adhesive 10 only to the core holding metal fitting 4 at an intermediate portion thereof.